after much time fussing about i partially found out the problem:
When using VLC, it does a YUV >RGB conversion, i’ve done a bit of research into this but not too much, anyway this is on by default and when you turn it off – it is then correctly shown in the right contrast.
as for quicktime, there must be some kind of hardware/software conflict because when using hardware accleration (directdraw etc) it shows in *green*, as in the whole thing is green – this flashes on and off. When i disabled hardware accleration, the green goes away but it is *very* stuttery (but correct contrast). I’ve tried repairing quicktime and downloading the latest but no success.
when hardware accleration on with quicktime and i shrink the window down – it seems to jump from the start frame to the middle frame (very quick flicker).
Anyway, what didn’t help was that I had installed a codec pack and from there i was unable to easily turn off the yuv to rgb conversion.